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m4n8tpr8b replied to the thread Hubble tension is now in our cosmic backyard, sending cosmology into crisis.Currently, the extrapolation forwards is accelerating expansion forever, but the exact details depend on factors we don't know enough... -
m4n8tpr8b replied to the thread Astronomers discover 196-foot asteroid with 1-in-83 chance of hitting Earth in 2032.You're waaaaaaay behind the news, like 20 years and one month behind. The chance for a 20 December 2029 impact of Aphophis was predicted...
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m4n8tpr8b replied to the thread Astronomers discover 196-foot asteroid with 1-in-83 chance of hitting Earth in 2032.Good observation. For 2024 YR4, NASA currently also considers impacts in 2039, 2043, 2047 & 2074, all with very low probability due to...
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m4n8tpr8b replied to the thread Hubble tension is now in our cosmic backyard, sending cosmology into crisis.Nope. You still think of space as some independent ethereal background (within which the Big Bang was an explosion), instead of...
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m4n8tpr8b replied to the thread Hubble tension is now in our cosmic backyard, sending cosmology into crisis.You start from a good foundation but go off in some bad direction. You correctly say that time is a fourth dimension orthogonal to the...
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m4n8tpr8b replied to the thread Hubble tension is now in our cosmic backyard, sending cosmology into crisis.The other commenter was wrong, using CMB is not a "direct" measurement, either, there is no such thing. It is a comparison of the scale...
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m4n8tpr8b reacted to Torbjorn Larsson's post in the thread Hubble tension is now in our cosmic backyard, sending cosmology into crisis with
Like.
Cosmological redshift is not a Doppler shift, and no physicist has claimed that in a century, I think. But is caused by photons being... -
m4n8tpr8b replied to the thread Astronomers discover 196-foot asteroid with 1-in-83 chance of hitting Earth in 2032.2024 YR4 first got the attention of astronomers on December 30, when the impact risk was estimated at about a tenth of the current...
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m4n8tpr8b replied to the thread Hubble tension is now in our cosmic backyard, sending cosmology into crisis.To have a perspective on this, it is worth to remember that this is not the first time we have Hubble tension. Throughout the 1990s, the...
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m4n8tpr8b replied to the thread China plans to deflect an asteroid by 2030 to showcase Earth protection skills.Obviously, the energy (or moment) needed to deflect an object is proportional to its mass, and the more time we have, the more energy...
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m4n8tpr8b replied to the thread What happened to the flags Apollo astronauts left on the moon?.But there is not much oxygen there. There are less than 500 atoms per cubic centimetre in the Moon's "atmosphere". Using the room...
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m4n8tpr8b replied to the thread China plans to deflect an asteroid by 2030 to showcase Earth protection skills.I'm all for cleaning the planet and stopping wars, but those aren't in an either-or relationship with protection against natural...
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m4n8tpr8b replied to the thread China plans to deflect an asteroid by 2030 to showcase Earth protection skills.Ugh. This user was banned since; but the comment is so spectacularly stupid that I have to address it even half a year later. Such a...
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m4n8tpr8b replied to the thread How big can 'ultramassive' black holes get? Scientists may have the answer.You quote the researcher defining supermassive and ultramassive black holes as more than 10 million resp. 10 billion solar masses, but...
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m4n8tpr8b replied to the thread Cataclysmic' solar storm hit Earth around 2687 years ago, ancient tree rings reveal.There is an 11,400-year reconstruction of sunspot numbers based on tree ring & radiocarbon data which doesn't resolve solar cycles but...
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